256687460 has 48 divisors (see below), whose sum is σ = 551299392. Its totient is φ = 100368000.

The previous prime is 256687423. The next prime is 256687477. The reversal of 256687460 is 64786652.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166895 + ... + 168425.

It is an arithmetic number, because the mean of its divisors is an integer number (11485404).

Almost surely, 2^256687460 is an apocalyptic number.

256687460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256687460 is an abundant number, since it is smaller than the sum of its proper divisors (294611932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256687460 is a wasteful number, since it uses less digits than its factorization.

256687460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724 (or 1722 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 256687460 is about 16021.4687216872. The cubic root of 256687460 is about 635.5282850315.

The spelling of 256687460 in words is "two hundred fifty-six million, six hundred eighty-seven thousand, four hundred sixty".